Complete
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7 9 13 16 5 18 1 10 2 8 15 14 3 12 11 4 17 6
  1. 5a Booby prize (6,5)
  2. 7a Of a dull greenish-brown colour (4)
  3. 8a Acquiring knowledge (8)
  4. 9a Absent from work because of illness (3,4)
  5. 11a Courted (5)
  6. 13a Old coin worth four pence (5)
  7. 14a From Valletta, perhaps (7)
  8. 16a Bamboozle (8)
  9. 17a Male — something that stops here? (4)
  10. 18a Unpleasant (11)
  11. 1d Search thoroughly (4)
  12. 2d Marital state (7)
  13. 3d Customary (5)
  14. 4d Discovered (5,3)
  15. 5d Verbatim (4,3,4)
  16. 6d Ridiculous (11)
  17. 10d Slipshod (8)
  18. 12d Trading places (7)
  19. 15d Backless couch (5)
  20. 17d Enthusiast (4)